Hello RRunner and welcome to Amiga.org.
Sorry to hear that you have lost all your disks. You might be able to find the GVP disk images on the net somewhere and download them, but then you would need some way to get them transferred to an Amiga formatted floppy disk.
Do you remember what version of Workbench you were running before the A2000 died?
I am afraid in it's current state, your A2000 is not worth much. Probably less than what it would cost to ship it, but perhaps more since it does have an 030 accellerator in it with extra RAM. You could try to sell it on eBay. That is one place where you can never tell how much it will go for. Sometimes an auction will go way up for no apparent reason and you will get lucky. You could also separate the accelerator card and auction it separately to get more money.
Good luck!